Fixed wing Unmanned Aerial Vehicle

Where should the relative position of the aerodynamic center and the center of gravity of the fixed wing UAV be for static longitudinal stability and why?

My general moment calculation says that the aerodynamic center should lie ahead of the center of gravity so that the lift produced gives a nose up moment about the C.G which is then balanced by the vertical force produced by the horizontal stabilizer that gives pitching down moment about the C.G. But many literature suggest C.G to be ahead of the Aerodynamic center for static longitudinal stability.

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